The commissioners appointed in pursuance of the fifth article of the treaty of amity, commerce, and navigation between the United States and His Britannic Majesty to determine what river was truly intended under the name of the river St. Croix mentioned in the treaty of peace, and forming a part of the boundary therein described, have finally decided that question. On the 25th of October they made their declaration that a river called Scoodiac, which falls into Passamaquoddy Bay at its northwestern quarter, was the true St. Croix intended in the treaty of peace, as far as its great fork, where one of its streams comes from the westward and the other from the northward, and that the latter stream is the continuation of the St. Croix to its source. This decision, it is understood, will preclude all contention among individual claimants, as it seems that the Scoodiac and its northern branch bound the grants of land which have been made by the respective adjoining Governments. A subordinate question, however, it has been suggested, still remains to be determined. Between the mouth of the St. Croix as now settled and what is usually called the Bay of Fundy lie a number of valuable islands. The commissioners have not continued the boundary line through any channel of these islands, and unless the bay of Passamaquoddy be a part of the Bay of Fundy this further adjustment of boundary will be necessary. But it is apprehended that this will not be a matter of any difficulty. Such progress has been made in the examination and decision of cases of captures and condemnations of American vessels which were the subject of the seventh article of the treaty of amity, commerce, and navigation between the United States and Great Britain that it is supposed the commissioners will be able to bring their business to a conclusion in August of the ensuing year. The commissioners acting under the twenty-fifth article of the treaty between the United States and Spain have adjusted most of the claims of our citizens for losses sustained in consequence of their vessels and cargoes having been taken by the subjects of His Catholic Majesty during the late war between France and Spain. Various circumstances have concurred to delay the execution of the law for augmenting the military establishment, among these the desire of obtaining the fullest information to direct the best selection of officers. As this object will now be speedily accomplished, it is expected that the raising and organizing of the troops will proceed without obstacle and with effect. _Gentlemen of the House of Representatives_: